HoloLens still isn't a widely available consumer product, but you can buy the $3,000 Development Edition if you want, however, it is expected that at some point, Microsoft will release a more cost-effective consumer model. The device itself has remained fairly stagnant for some time.

Known issue: Users may experience reliability issues with using voice to place Skype calls or launch apps for the first time.

If you don't already have last week's build installed, in order to install the new update, you'll have to do a bit of work. First, you need to enroll in the Windows Insider Program by going to Settings -> Update & Security -> Get Insider Preview builds -> Get started. Then, you'll need to sideload the build with the Windows Device Recovery Tool using the 'Manual package selection' option. After that, you'll need to go through the out-of-box experience.

If you installed build 17123 last week, all you'll need to do to get build 17133.1004, is check for updates.